Package memcache provides an implementation of httpcache.Cache that uses
gomemcache to store cached responses.
When built for Google App Engine, this package will provide an
implementation that uses App Engine's memcache service. See the
appengine.go file in this package for details.
New returns a new Cache using the provided memcache server(s) with equal
weight. If a server is listed multiple times, it gets a proportional amount
of weight.